The RSU income is taxable by both California and New York. Since you are a New York resident, you will take a credit for taxes paid to another state. You don't have to allocate a period of time to working in California, you just have to have California sourced income. You should prepare your non-resident California return first, and then prepare your New York resident return.
If you created your resident state return before you began work on your nonresident state return, TurboTax may not properly calculate the New York credit for taxes paid to California.
To fix this issue, you will need to remove your resident state return and then create a new resident state return. Doing this has the same effect as entering your non-resident state first, which is how the returns should be entered.
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